<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区 -->
      <el-row>
        <el-col>
          <el-button type="primary">
            添加角色
          </el-button>
        </el-col> 
      </el-row>

      <!-- 角色列表区域 -->
      <el-table :data="rolelist" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <!-- 栅格系统的布局组件 -->
            <el-row :class="['bdbottom', index === 0 ? 'bdtop' : '', 'vcenter']" v-for="(item1, index) in scope.row.children"
            :key="index">
              <!-- 渲染一级权限 -->
              <el-col :span="5">
               <el-tag closable
                @close="removeRightById(scope.row,
                item1.id)"> {{item1.authName}}</el-tag>
               <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 通过 for 循环 嵌套渲染二级权限 -->
                <el-row :class="[index === 0 ? '' : 'bdtop', 'vcenter']" v-for="(item2, index) in item1.children" 
                :key="index">
                  <el-col :span="6">
                    <el-tag type="success" closable
                    @close="removeRightById(scope.row,
                    item2.id)">{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag type="warning" v-for="(item3, index) in item2.children"
                    :key="index" closable
                    @close="removeRightById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- <pre>
              {{scope.row}}
            </pre>   -->
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
            <el-button size="mini" type="warning"
            icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>

    </el-card>

    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="clearLeafKeys">
      <!-- 这是树形控件 -->
      <el-tree :data="rightslist" :props="treeProps" show-checkbox
      node-key="id" default-expand-all 
      :default-checked-keys="defKeys" ref="treeRef"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" 
        @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default{
    name: 'Roles',
    data() {
      return {
        // 所有角色列表数据
        rolelist: [],
        // 控制分配权限对话框的显示与隐藏
        setRightDialogVisible: false,
        // 所有权限的数据
        rightslist: [],
        // 树形控件的属性绑定对象
        treeProps: {
          label: 'authName',
          children: 'children'
        },
        // 默认选中的节点Id值数组
        defKeys: [],
        // 当前即将分配权限的角色id
        roleId: ''
      }
    },
    created() {
      this.getRolesList()
    },
    methods: {
      // 获取所有角色列表
      async getRolesList() {
        const {data: res} = await this.$http.get('roles')

        if(res.meta.status !== 200) {
          return this.$message.error('获取角色列表数据失败')
        }

        this.rolelist = res.data
        console.log(this.rolelist)
      },
      // 根据Id删除对应的权限
      async removeRightById(role, rightId) {
        // 弹框提示用户是否删除
        const confirmResult = 
        await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)

        if(confirmResult !== 'confirm') {
          return this.$message.info('取消了删除!')
        }

        const {data: res} = await this.$http.delete
        (`roles/${role.id}/rights/${rightId}`)

        if(res.meta.status !== 200) {
          return this.$message.error('删除权限失败')
        }

        // this.getRolesList()
        role.children = res.data
      },
      // 展示分配权限的对话框
      async showSetRightDialog(role) {
        this.roleId = role.id
        // 获取所有权限的数据
        const {data: res} = await this.$http.get('rights/tree')

        if(res.meta.status !== 200) {
          return this.$message.error('获取权限数据失败')
        }

        // 把获取到的权限数据保存到 data 中
        this.rightslist = res.data

        // 递归获取三级节点的Id
        this.getLeafKeys(role, this.defKeys) 

        this.setRightDialogVisible = true;
      },
      // 通过递归的形式,获取角色下所有三级权限的id,
      // 并保存到数组 defKeys 数组中
      getLeafKeys(node, arr) {
        // 如果当前 node 节点不包含 children 属性,则是三级节点
        if(!node.children) {
          return arr.push(node.id) 
        }

        node.children.forEach(item => 
        this.getLeafKeys(item, arr))
      },
      // 监听分配权限对话框的关闭事件
      clearLeafKeys() {
        this.defKeys = []
      },
      // 点击为角色分配权限
      async allotRights() {
        const keys = [
          ...this.$refs.treeRef.getCheckedKeys(),
          ...this.$refs.treeRef.getHalfCheckedKeys()
        ]

        const idStr = keys.join(',')  

        const { data: res } = await this.$http.post(`roles/
        ${this.roleId}/rights`, { rids: idStr })

        console.log(res)

        if(res.meta.status !== 200) {
          return this.$message.error('分配权限失败!')
        }

        this.$message.success('分配权限成功')

        this.getRolesList()
        this.setRightDialogVisible = false
      }
    }
  }
</script>

<style lang="less" scoped>
  .el-tag {
    margin: 7px;
  }

  .bdtop {
    border-top: 1px solid #eee;
  }

  .bdbottom {
    border-bottom: 1px solid #eee;
  }
   
  .vcenter {
    display: flex;
    align-items: center;
  }
</style>
